Q1. Which of the following is not a valid extension for an audio file?
Explanation
The extension .rar is used for compressed archive files, not for audio files. The extension .mid is associated with MIDI audio data, so it can represent audio-related content. The extension .wav is a standard waveform audio format used for sound files. The extension .mp3 is a widely used compressed audio format. Since the question asks for the extension that does not correspond to a valid audio file type, the archive extension .rar is the correct choice.
